if you want to know what gears you have, you need to keep the driveshaft in. Then get a piece of chalk, or something else to mark the tire and driveshaft with. jack up the truck by the axle. And somebody to rotate the tire 360 degrees, while you are under the driveshaft (w/ the shaft marked before you rotate the tire), and count how many times it goes around. If it goes around 3 and 3/4 times, then you have 3.73 gears. If it goes by a bit under 3 1/2 times, then you have 3.42 gears. And so on, and so forth.
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